# NTSB WPR14LA059: Cessna 210, N6575X, Florence, OR, November 29, 2013 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: November 29, 2013, 15:00 local (23:00 UTC) - Place: Florence, OR - Coordinates: 43.980556, -124.110557 - Nearby events: https://openairdocs.org/map.md?lat=43.9806&lon=-124.1106&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern downwind: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report December 15, 2014 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 88497 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR14LA059 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/88497/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=88497 - Page: https://openairdocs.org/ntsb/WPR14LA059 ## Probable cause The failure of the hydraulic power pack, which prevented the extension of the landing gear and resulted in a partial gear-up landing. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Cessna 210, 6 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2073402), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) - [Hydraulic power system: pressure regulator, main](https://openairdocs.org/ntsb-findings/01022917): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Cessna 210, 1 case](https://openairdocs.org/ntsb-findings/01022917/cases.md?model=2073402), [All aircraft, 1 case](https://openairdocs.org/ntsb-findings/01022917/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-VFR pattern downwind: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) (defining event); cases with it: [Cessna 210, 6 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=2073402), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Cessna 210, 6 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=2073402), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 210, 9 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2073402), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that the landing gear actuator had been rebuilt and that all ground tests were uneventful. During the takeoff for the maintenance test flight, the landing gear retracted normally. However, when selected to the extend position for landing, the left and right main landing gear would not extend. The nosewheel landing gear did extend and lock in the down position. The pilot's numerous attempts to raise or lower the main landing gear were unsuccessful. The pilot initiated a partial gear-up landing, and, during the landing, the left horizontal stabilizer struck the runway. Multiple attempts to retract or extend the landing gear during postaccident examinations were unsuccessful. During functional tests of the hydraulic power pack, the power pack extended the landing gear; however, it did not extend or retract the flaps. In addition, the power pack did not retract the landing gear or build up any pressure with the hand pump. Further examination of the hydraulic pack revealed that the No. 1 thermal relief valve lost pressure after it was relieved and that four poppet assemblies did not hold pressure. ## Factual narrative On November 29, 2013, about 1500 Pacific standard time, a Cessna 210, N6575X, was substantially damaged during landing at the Florence Municipal Airport (6S2), Florence, Oregon. The airplane was registered to a private individual and operated by the pilot under the provisions of Title 14 Code of Federal Regulations Part 91. The airline transport pilot and his passenger were not injured. Visual meteorological conditions prevailed and no flight plan was filed for the personal flight. The local flight originated from 6S2 about 1400. The pilot reported that prior to the flight, the landing gear actuator was rebuilt and all subsequent ground tests were uneventful. The pilot and passenger proceeded to conduct a local maintenance test flight. During the flight, the landing gear retracted normally, however, when it was extended, the left and right main landing gear would not extend. The pilot stated that the nose wheel landing gear was extended and locked in the down position, and that despite numerous attempts he was unable to raise or lower the landing gear. The pilot initiated a partial gear up landing to Runway 33. During the landing roll the left horizontal stabilizer struck the runway. Postaccident examination of the airplane by the pilot revealed that the left horizontal stabilizer and elevator were bent upward about 10 degrees. The airplane was recovered to a secure location for further examination. Examination of the airframe by a Federal Aviation Administration (FAA) inspector was conducted on December 19, 2013, at the owner's hangar. The airplane was placed on jacks and a hydraulic mule was attached to the hydraulic system. Despite multiple attempts, the landing gear would not retract or extend. The hydraulic power pack was subsequently removed and retained for further examination. The hydraulic power pack, part number EA1332-1, serial number 699, was examined by APPH, Wichita, Kansas, under the supervision of an FAA inspector. The examination revealed that all safety wire was intact and no evidence of system contamination was found. The power pack was placed on a test bench and functionally tested using the Cessna 210 Service Manual instructions. During the test, the system would allow the landing gear to be extended, however, would not allow the flaps to be extended or retracted. In addition, the unit did not allow the landing gear to be retracted or build up any pressure with the hand pump. Further examination of the hydraulic pack revealed that the number one thermal relief valve lost pressure after it was relieved. Four poppet assemblies did not retain pressure during the test. In addition, the hand pump assembly spring was not correct for the make/model hydraulic power pack. No additional anomalies were noted during the examination. Review of the maintenance logbook records for the airplane revealed that an entry dated April 8, 2013, at tach time of 1,854.9 hours and airframe total time of 1,885.7 hours, stated in part "….repaired leakin hydraulic power pack." No further entries were noted within the logbook regarding the hydraulic power pack. ## Aircraft - Registration: [N6575X](https://openairdocs.org/deregistered/N6575X-2020-03-04), registration cancelled 2020-03-04, S/N 57575 (OpenAirDocs) - Reported make and model: CESSNA 210 - Registry model: [Cessna 210](https://openairdocs.org/model/cessna-210) (registry code 2073402) (OpenAirDocs) - Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 57575 - Year built: 1960 - Airframe hours: 1865 - Engines: Continental IO-470-E 250 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Eric Baldwin - Registered owner: Large Nathan G - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 12, 2013, 3 hours before - Departed: 6S2, Florence, OR - Destination: 6S2, Florence, OR - Airport: 6S2, Florence Municiple, runway 33, 3,000 × 60 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 58; injuries: none; flight engineer, airline transport; airplane ratings: multi-engine land, single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review June 28, 2012; seat: right; restraint: 3-point; flight hours: 4,209 total, 10 in this make and model, 3,673 as pilot in command, 16 in the last 90 days, 7 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 340° at 4 knots - Visibility: 5 statute miles - Lowest ceiling: 11,000 ft overcast - Temperature: 48 °F, dew point 45 °F - Altimeter: 30.30 inHg - Observed at: KONP, 36 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20131129023729A](https://openairdocs.org/incident/20131129023729A), Nov 29, 2013: Cessna 210, Florence, OR, Substantial damage. Pilot was performing a maintenance flight check after landing gear actuator repair. All gear retracted normally but only nose gear extended when gear handle… ## Docket (5 files) The files NTSB released with the investigation on October 10, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=88497. 1.6 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 828 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40417616&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - APPH Report for Hydraulic Pack Examination (item 2, .PDF, 36 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40417617&FileExtension=.PDF&FileName=APPH%20Report%20for%20Hydraulic%20Pack%20Examination-Redacted.PDF - FAA Inspector Statement (item 3, .PDF, 108 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40417618&FileExtension=.PDF&FileName=FAA%20Inspector%20Statement-Redacted.PDF - Logbook Entry (item 4, .PDF, 549 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40417619&FileExtension=.PDF&FileName=Logbook%20Entry-Redacted.PDF - Evidence Control Form – Hydraulic Power Pack (item 5, .PDF, 72 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40417620&FileExtension=.PDF&FileName=Evidence%20Control%20Form%20%E2%80%93%20Hydraulic%20Power%20Pack-Master.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.